It includes a file called "MSWIII_Dictionary.dic," which is a custom dictionary containing all valid linnean rank names (from order to species epithet) for mammals, according to Wilson & Reeder's Mammal Species of the World, 3rd Edition.

Now my manuscripts have a lot less red underlining!

Note that all derivations of names (e.g., "tenrecid" or "afrotherian") are not included, but can easily be added by opening the .dic file in a text editor.